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It’s been almost three decades since the first-ever MTV Video Music Awards. And from the very beginning, stars like Madonna aimed to please their fans by shocking them, with a combination of risqué routines—remember that “Like A Virgin” floor dance?—and outré fashion. So, in anticipation of the award show’s 27th iteration, which airs on Sunday, September 12, at 9 p.m. EST, InStyle looks back at five of the most memorable VMA performances and appearances ever, and wonders: Can we still be shocked, or have we seen it all? We’ll be watching to find out.